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DOI | 10.1002/joc.4703 |
Low-frequency oscillations of East Asia/Pacific teleconnection and simultaneous weather anomalies/extremes over eastern Asia | |
Chen, Yang1,2; Zhai, Panmao1; Li, Lei1 | |
2017 | |
发表期刊 | INTERNATIONAL JOURNAL OF CLIMATOLOGY
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ISSN | 0899-8418 |
EISSN | 1097-0088 |
出版年 | 2017 |
卷号 | 37期号:1 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | The East Asia/Pacific (EAP) teleconnection can substantially modulate weather anomalies over eastern Asia during summer. Wavelet analyses, including ensemble mean power spectrum and accumulated frequency of significant components, highlight 10-30-day oscillations in the EAP index. The influences of these low-frequency oscillations on weather anomalies are further investigated via both phase-dependent and lead-lag composites. On 10-30-day scales, a tripole structure of precipitation anomalies and a temperature seesaw form concurrently over adjacent regions along eastern Asia. These anomalies last for about 1week, constituting anomalous weather spells with possible extreme values around the peak/valley phases. For cold spells over Northeast Asia during positive phases, the low-frequency easterly is the determinant factor. On one hand, it advects cold air from the sea east of the land. On the other hand, it conveys moisture to form low-based clouds, which are effective in inhibiting incoming solar radiation. While, for cold spells over central-eastern Siberia during negative phases, regional-scale precipitation and cold advections conveyed by anomalous northerlies combine to make contributions. Both hot spells over central-eastern Siberia/Northeast Asia during positive/negative phases mainly result from the adiabatic heating and increasing solar radiation, both of which are attributed to strong descent in response to upper-level convergences. In addition to great intensity, the high-impact property of these simultaneous weather anomalies also arises from their long duration and large spatial extent. By taking advantages of the quasi-periodicity of the 10-30-day oscillations, better predictions of these simultaneous weather anomalies/extremes would be anticipated. |
英文关键词 | East Asia/Pacific teleconnection low-frequency oscillations simultaneous weather anomalies duration weather extremes |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000392415700021 |
WOS关键词 | WESTERN NORTH PACIFIC ; NORTHEASTERN UNITED-STATES ; COOL-SEASON PRECIPITATION ; SHEARED ZONAL FLOW ; LARGE-SCALE FLOW ; SUMMER MONSOON ; INTRASEASONAL OSCILLATION ; EQUATORIAL WAVES ; ATLANTIC OSCILLATION ; CLIMATE VARIABILITY |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/36658 |
专题 | 气候变化 |
作者单位 | 1.CMA, Chinese Acad Meteorol Sci, State Key Lab Severe Weather, 46 South Ave, Beijing, Peoples R China; 2.Nanjing Univ Informat Sci & Technol, Dept Atmospher Sci, Nanjing, Jiangsu, Peoples R China |
推荐引用方式 GB/T 7714 | Chen, Yang,Zhai, Panmao,Li, Lei. Low-frequency oscillations of East Asia/Pacific teleconnection and simultaneous weather anomalies/extremes over eastern Asia[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2017,37(1). |
APA | Chen, Yang,Zhai, Panmao,&Li, Lei.(2017).Low-frequency oscillations of East Asia/Pacific teleconnection and simultaneous weather anomalies/extremes over eastern Asia.INTERNATIONAL JOURNAL OF CLIMATOLOGY,37(1). |
MLA | Chen, Yang,et al."Low-frequency oscillations of East Asia/Pacific teleconnection and simultaneous weather anomalies/extremes over eastern Asia".INTERNATIONAL JOURNAL OF CLIMATOLOGY 37.1(2017). |
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